| commit | b0535bddd688609c014c2d65d56f67eb618e72fe | [log] [tgz] |
|---|---|---|
| author | Vyacheslav Egorov <vegorov@google.com> | Thu Apr 25 14:26:55 2024 +0000 |
| committer | Commit Queue <dart-scoped@luci-project-accounts.iam.gserviceaccount.com> | Thu Apr 25 14:26:55 2024 +0000 |
| tree | f83a8ed26269eca839cbc4b46c466e9986b39023 | |
| parent | 350954ae9d26ae7b8055df0e18ee2e6875aede8d [diff] |
[vm] Add pragma vm:unsafe:no-bounds-checks This pragma instructs compiler to remove all bounds checks from the annotated function. This can be helpful when tuning performance of hot tight loops where compiler is unable to eliminate bounds check itself. For very tight loops I have measured 25-50% overhead from bounds checks which I think comes from some combination of general code quality issues due to fixed input registers and increased branch density. In future it could be possible to teach our range analysis to eliminate bounds checks when loop bound is itself bounded by array length, but for now we can resort to this pragma for extremely hot library code. Issue https://github.com/dart-lang/sdk/issues/55522 TEST=vm/cc/BoundsCheckElimination_Pragma R=alexmarkov@google.com Change-Id: Ia7b1e88a16a2b45fa8593a227a4985568892b29c Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/364500 Reviewed-by: Alexander Markov <alexmarkov@google.com> Commit-Queue: Slava Egorov <vegorov@google.com>
Dart is:
Approachable: Develop with a strongly typed programming language that is consistent, concise, and offers modern language features like null safety and patterns.
Portable: Compile to ARM, x64, or RISC-V machine code for mobile, desktop, and backend. Compile to JavaScript or WebAssembly for the web.
Productive: Make changes iteratively: use hot reload to see the result instantly in your running app. Diagnose app issues using DevTools.
Dart's flexible compiler technology lets you run Dart code in different ways, depending on your target platform and goals:
Dart Native: For programs targeting devices (mobile, desktop, server, and more), Dart Native includes both a Dart VM with JIT (just-in-time) compilation and an AOT (ahead-of-time) compiler for producing machine code.
Dart Web: For programs targeting the web, Dart Web includes both a development time compiler (dartdevc) and a production time compiler (dart2js).
Dart is free and open source.
See LICENSE and PATENT_GRANT.
Visit dart.dev to learn more about the language, tools, and to find codelabs.
Browse pub.dev for more packages and libraries contributed by the community and the Dart team.
Our API reference documentation is published at api.dart.dev, based on the stable release. (We also publish docs from our beta and dev channels, as well as from the primary development branch).
If you want to build Dart yourself, here is a guide to getting the source, preparing your machine to build the SDK, and building.
There are more documents on our wiki.
The easiest way to contribute to Dart is to file issues.
You can also contribute patches, as described in Contributing.
Future plans for Dart are included in the combined Dart and Flutter roadmap on the Flutter wiki.